
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    background: linear-gradient(135deg, #6a11cb, #2575fc); /* 渐变背景 */
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh; /* 使页面内容垂直居中 */
}

.container {
    background-color: rgba(255, 255, 255, 0.9); /* 容器背景颜色（半透明） */
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2); /* 容器阴影 */
    text-align: center;
    max-width: 800px;
    width: 100%;
}

h2 {
    color: #333;
    margin-bottom: 25px;
    font-size: 28px;
    font-weight: 600;
}

.actions-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.action-button {
    padding: 10px 20px;
    background-color: #007bff;
    color: white;
    border-radius: 8px;
    text-decoration: none;
    transition: all 0.3s ease;
}

.action-button:hover {
    background-color: #0056b3;
}

.return-button {
    background-color: #6c757d;
}

.return-button:hover {
    background-color: #5a6268;
}

form {
    margin-bottom: 20px;
}

form label {
    display: block;
    margin-bottom: 5px;
    color: #555;
    font-weight: bold;
}

form input {
    width: 100%;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 4px;
    margin-bottom: 15px;
}

form button {
    padding: 10px 20px;
    background-color: #28a745;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

form button:hover {
    background-color: #218838;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
}

table th, table td {
    padding: 10px;
    text-align: center;
    border: 1px solid #ddd;
}

table th {
    background-color: #f2f2f2;
    font-weight: bold;
    color: #333;
}

table tbody tr:nth-child(even) {
    background-color: #f9f9f9;
}

table tbody tr:hover {
    background-color: #e9e9e9;
}

.error-message {
    color: #ff4d4d;
    font-size: 18px;
    font-weight: 500;
}